Orazio Mariani (21 January 1915 – 16 October 1981) was an Italian athlete who competed mainly in the 100 metre sprint and competed at the 1936 Summer Olympics.

[1] Mariani competed for Italy in the 1936 Olympic Games, held in Berlin, Germany, in the 4 x 100 metre relay, where he won the silver medal with his team mates Gianni Caldana, Elio Ragni and Tullio Gonnelli.

[1] Mariani finished second behind Tinus Osendarp in the 100 yards event at the British 1938 AAA Championships.

[2][3][4] Soon after, in September at the 1938 European Athletics Championships, Mariani won the silver medal in the 200 metres.

Orazio Mariani has won 8 times the individual national championship.